901:5-3-04
Markings on containers and systems.

(A)
Container nameplates must be legible,
permanently attached to the container and accessible for inspection. Container
nameplates shall include markings as prescribed in paragraph (B) unless the
container has been issued special permit DOT SP13554 by the United States
department of transportation.

(7)
With marking indicating
the maximum level to which the container may be filled with liquid anhydrous
ammonia at temperatures between twenty degrees Fahrenheit and one hundred
degrees Fahrenheit except on containers provided with fixed maximum level
indicators, such as fixed length dip tubes, or containers that are filled by
weight. Markings shall be in increments of not more than ten degrees
Fahrenheit;

(10)
Marking specified on container shall be
on the container itself or on a nameplate permanently affixed thereto;

(C)
All main operating
valves on permanently installed containers having a capacity of over three
thousand water gallons shall be identified to show whether the valve is in
liquid or vapor service. The method of identification shall be legend or color
code as specified in:

(1)
Legend: The legend
"LIQUID" (or "LIQUID VALVE"), or "VAPOR" (or "VAPOR VALVE"), as appropriate,
shall be placed on or within twelve inches of the valve by means of a stencil,
tag, or decal;

(2)
Color code:
Liquid valves shall be painted Omaha orange or equivalent and vapor valves
shall be painted safety yellow or equivalent. The legend "OMAHA ORANGE LIQUID",
or "SAFETY YELLOW VAPOR" shall be displayed in one or more conspicuous places
at each permanent storage location. The legend shall have letters at least two
inches high and shall be placed against a contrasting background.